Image Caption: STS073-725-046 Green River, Utah, U.S.A. September 1995The Green River in northeastern Utah, the largest tributary of the Colorado River, flows southwest in this south-looking, low-oblique photograph. Visible south of the snow-covered Yampa Plateau (top left) is the White River, a major tributary of the Green River. Several wildlife refuges are scattered along the Green River, including Ouray National Wildlife Refuge (north of the confluence of the Green and White Rivers). The western portion of Dinosaur National Monument is barely discernible (below left center).